Cash Advance Loans Cash Advance Loans

Solar Cycle And Dancing Lights- Aurora 2013

October 8, 2013

As described in my earlier posts, our local star Sun, undergoes a natural cycle of roughly 11 years and  it’s peak activity it is manifested by increase in number of solar spots, coronal mass ejections (CME), enormous magnetic waves.  CMEs when they travel to earth are then directed by earth’s magnetic fields towards earths poles which leads to display of beautiful Aurora or dancing lights. Auroras are result of the interaction between ions and electrons from the solar wind with Earth’s magnetic field and upper atmosphere. During Coronal Mass Ejections from the sun, high energetic ions are bombarded towards the earth. These ions migrate towards poles due to Earth’s magnetic fields, that’s why this phenomenon is seen mostly at Northern and Southern poles of the earth. These high energetic ions interact with Oxygen and Nitrogen of the upper atmosphere and excite them to higher energy levels. When the atoms fallback to ground state it emits light typical to particular atom. Oxygen emits at a wavelength of 558 nm (green) and at 630 nm (red ). Emission at 558 nm is more prominent and that’s how Aurora gets it’s greenish color. A slight tinge of red color can also be seen at times.  Auroras in other colors have also been seen such as blue and purple but green ones are most prominent. Here is a beautiful timelapse video captured by Christian Mülhauser in Norway during Feb 2013.

2013 is supposed to be solar maxima but unfortunately, our Sun has been low in activity and has defied many predictions, probably the weakest in more than a century. Solar activity is also measured by the number of solar spots observed and this time maximum solar spots observed has been 67 (observed in Feb 2011) and since then it has been low and it appears that it will slowing down now onwards. As compared to this cycle, more than ~150 sun spots (2003) were observed in last solar cycle.

A lull in solar activity means reduced Aurora display on earth which is sad. Although last week there was a short burst of activity which resulted on some Aurora display and was captured by Astro Photographer Göran Strand in Sweden on Oct 2nd, 2013. Enjoy the videos by  Göran Strand and Christian Mülhauser and hopefully solar activity picks up!

Soruces:  http://solarscience.msfc.nasa.gov/predict.shtml

http://www.astrofotografen.se/

https://vimeo.com/62534688

Filed under: Favourite,Science,Video

Tags: , ,

Leave a Comment

(required)

(required), (Hidden)

XHTML: You can use these tags: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>

TrackBack URL  |  RSS feed for comments on this post.


Subscribe




Video of the Day

Categories

Archives

Recent Posts

My Links

Pages

Google News
U.S. : Top News

RSS CNN IBN News

Tag Cloud

Music Video of The Day

RSS TED Talks

Born on this day

December 7, 2019
1845 Thomas Barnado
1885 Louis B. Meyer
1900 Louis Armstrong
1924 Eva Marie Saint
1927 Neil Simon
1927 Gina Lollobridgida
1934 Colin Welland
1942 H.R.H. Prince Michael of Kent
1962 Pam Shriver
Joe's